<template>
  <ul class="app-header-nav">
    <li class="home"><RouterLink to="/">首页</RouterLink></li>
    <li v-for='item in list' :key='item.id' @mousemove='show(item.id)' @mouseleave='hide(item.id)'>
      <RouterLink :to='`/category/${item.id}`' @click='hide(item.id)'>{{ item.name }}</RouterLink>
      <div class="layer" :class='{open: item.open}'>
        <ul>
          <li v-for='subItem in item.children' :key="subItem.id">
            <RouterLink :to='`/category/sub/${subItem.id}`' @click='hide(item.id)'>
              <img :src='subItem.picture' alt="">
              <p>{{ subItem.name }}</p>
            </RouterLink>
          </li>
        </ul>
      </div>
    </li>
  </ul>
</template>

<script>
import { useStore } from 'vuex'
import { computed } from 'vue'
export default {
  name: 'AppHeaderNav',
  setup () {
    // 拿取vuex list分类数据
    const store = useStore()
    const list = computed(() => {
      return store.state.category.list
    })

    // 跳转要关闭二级类目 隐藏
    const show = (id) => {
      store.commit('category/show', id)
    }
    const hide = (id) => {
      store.commit('category/hide', id)
    }
    return { list, show, hide }
  }
}
</script>

<style scoped lang='less'>
  .app-header-nav {
    width: 820px;
    display: flex;
    justify-content: space-around;
    padding-left: 40px;
    position: relative; // 给layer定位用
    z-index: 998;
    > li {
      margin-right: 40px;
      width: 38px;
      text-align: center;
      > a {
        font-size: 16px;
        line-height: 32px;
        height: 32px;
        display: inline-block;
      }
      &:hover {
        > a {
          color: @xtxColor;
          border-bottom: 1px solid @xtxColor;
        }
        // > .layer {
        //   height: 132px;
        //   opacity: 1;
        // }
      }
    }
  }
  .layer {
    &.open {
      height: 132px;
      opacity: 1;
    }
    width: 1240px;
    background-color: #fff;
    position: absolute;
    left: -200px;
    top: 56px;
    height: 0;
    overflow: hidden;
    opacity: 0;
    box-shadow: 0 0 5px #ccc;
    transition: all .2s .1s;
    ul {
      display: flex;
      flex-wrap: wrap;
      padding: 0 70px;
      align-items: center;
      height: 132px;
      li {
        width: 110px;
        text-align: center;
        img {
          width: 60px;
          height: 60px;
        }
        p {
          padding-top: 10px;
        }
        &:hover {
          p {
            color: @xtxColor;
          }
        }
      }
    }
  }
</style>
